Removal of undesirable material from water-soluble polysaccharide ethers
US4988807A · kind A · utility
11Cited by
1References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1990 |
| Grant date | Jan 29, 1991 |
| Priority date | — |
| Expiry date | Apr 9, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/917
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A method of removing undesirable material from water-soluble polysaccharide ethers, such as water-soluble cellulose ethers, via contact of an aqueous solution of the water-soluble polysaccharide ether with an anion exchange resin. Anion exchange resins that are useful in the invention are derived from epoxy resin polymers, acrylic based copolymers or a copolymer of styrene-divinylbenzene. The method significantly reduces the amount of colored bodies in the polysaccharide ether.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.